Adding OnUpdate etc will refresh directory on hotload - avoiding the need to stop and start the game for them to start working Change BufferedHashSet to use a ConcurrentDictionary under the hood This hopefully fixes issues occurring when iterating multiple times, inside itself, and Count not changing until iterating. We should rename this to ConcurrentHashSet at some point. Make objectindex a BufferedHashSet so Scene.GetAll<T> doesn't suffer from modified while iterating Add GameObjectSystem<T>